Common Symptoms
- Check Engine Light illuminated
- Rough idle or engine misfire
- Poor fuel economy
- Loss of engine power or hesitation
- Engine runs on three cylinders
- Strong fuel odor from exhaust
Most Likely Root Causes
- Faulty fuel injector on cylinder 2
- Damaged or corroded wiring harness to injector
- Loose or corroded electrical connector at injector
- Failed injector driver circuit in PCM
- Internal short or open circuit in injector coil
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Component Location
The cylinder 2 fuel injector is mounted in the intake manifold or cylinder head, with cylinder numbering typically starting from the front of the engine.
Manufacturer Notes
Some vehicles may require injector flow testing or PCM update if driver circuit issues are suspected.
Also diagnosing J1939 SPN/FMI codes?
Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
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